The Ember Observer is a tool to discover ember-cli addons. They categorize, review, and give scores to each project they list.
Make sure you check the details about how they review and score addons before you choose one for your app.

A recurring question when starting with a new technology is "How do I get started?". Jon created a repository with some links to help beginners find great content. Know of a good link for beginners? Feel free to contribute with new items.